After successful verification, the patient \(P_{i}\)  sends a message that includes its pseudo ID \(PID_{P_{i}}\) , public key \(PU_{P_{i}}\) , pseudo ID of the medical professional \(PID_{MP_{i}}\) , and message generation timestamp \(t_{s}\)  to the medical professional \(MP_{i}\)  to authenticate himself/herself after successful verification. This message also contains some secret parameters to establish a secret shared key with the medical professional \(PID_{MP_{i}}\)  using Diffie-Hellman Key exchange protocol [1]} for secure RPM communication.
